How do i know what to do help me withe my amp and sub problem?

ok so i ahd my amp and subs all hooked up and i swaped ground and it touched the power cord i tryed re hooking it up i changed the fuse and the fuse coming from my power wire still amp wont turn on what should i do i tryed a different amp and it wont turn on eatherHow do i know what to do help me withe my amp and sub problem?Meter the constant wire. It's possible that it's a bad fuse.How do i know what to do help me withe my amp and sub problem?try another ruse if not then you wil have to check your fuse box and see if you blow any small fuse. either pull them all out or check with a test light